The Germans took Algiers on their turn.
The Allied turn N. Africa surrenders to Axis.
But in addition all the supply sources except the one city(port) disappear. The one port hex is the only hex that shows supply. All the UK units in N. Africa go to low supply state (half movement) which leaves them in bit of a fix for breaking contact with the German and Italian units.
During the German turn that follows they get to attack the UK units in there low supply state.
The Allied turn that follows shows supply has returned for the UK units in N. Africa.
Picture below is the Allied turn after the Germans take Algiers.

